OBD-II code · Powertrain (generic)
P0777 Pressure Control Solenoid B Stuck On
Pressure control solenoid B does not release line pressure when commanded — output pressure remains at maximum, leading to harsh shifts and elevated stress on the clutch packs and seals.
Is it safe to drive with P0777?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySolenoid stuck open by debris
- PossibleContaminated ATF clogging the pressure control valve
- Less likelyCarbon or debris buildup preventing free movement
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Pressure Control Solenoid B, Valve Body
Related codes
- P0747Pressure Control Solenoid A Stuck On
- P0797Pressure Control Solenoid C Stuck On
- P08BCPressure Control Solenoid L Stuck On
- P08C5Pressure Control Solenoid M Stuck On
- P2715Pressure Control Solenoid D Stuck On
- P2724Pressure Control Solenoid E Stuck On
- P2733Pressure Control Solenoid F Stuck On
- P27BAPressure Control Solenoid N Stuck On
- P27C2Pressure Control Solenoid P Stuck On
- P27CAPressure Control Solenoid R Stuck On
- P27D2Pressure Control Solenoid S Stuck On
- P27DAPressure Control Solenoid T Stuck On
- P0774Shift Solenoid E Intermittent
- P0775Pressure Control Solenoid B
- P0776Pressure Control Solenoid B Performance
- P0778Pressure Control Solenoid B Electrical
- P0779Pressure Control Solenoid B Intermittent
- P077AOutput Shaft Speed Sensor Circuit - Loss of Direction Signal
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.